What is uranium 238 used for dating rocks
Carbon Dating Another important dating technique is Carbon-14 dating.
This is used to date the remains of things that were once living.
With a little luck some of the points will plot close to the true age, increasing the precision of the date.
U-Pb ages are accurate to within less than 1 per cent, highly resistant to metamorphism, and are considered the most precise ages now available.
The number used to identify the isotope refers to the total number of particles in the nucleus of each atom.
Some of the different kinds of radioactive atoms used to date objects are shown in the following table: Potassium-Argon Dating Potassium atoms are used to date rocks that have formed from molten rock. Argon is an inert gasit does not chemically bond to other atoms.
Uranium minerals themselves are too uncommon to be very useful in dating.
The most common dating method involves the use of minerals like zircon and monazite that are relatively common in granitic rocks.
So a zircon formed in a granite, eroded and redeposited into sediments, which were then metamorphosed to gneiss, can often supply dates for both the gneiss and the original granite. You can't simply assume there was no initial lead in duch situations.Argon in molten rock can just bubble out and escape.Once the rock cools and solidifies, Argon that is formed by radioactive decay is trapped inside.There was probably radiogenic lead in the mineralizing fluids plus possibly lead leached out of the host rocks.Fortunately, there is Lead 204, which we can be sure has no radiogenic component.